Display Settings

Selected options are available for configuring the display, which relate to the presentation of the assessment content and the use of CBA ItemBuilder content, which is created with a defined aspect ratio (width and height).

Window Mode

In the Window Mode selection, it can be configured whether an additional window is displayed in the IRTlib Player. The configuration is implemented differently depending on the environment:

The online IRTlib Player can also display assessment content in full-screen mode if this option is selected. If full screen mode is exited in the browser, the assessment content is then hidden. As it is not possible to automatically switch to full-screen mode in a browser, the target person first sees the following message from the platform:

By clicking on the button Activate Full Screen the full screen mode is started and the assessment content is then displayed without window frames and navigation areas of the browser. For a short time, the browser then typically displays a message that full screen mode can be cancelled again with Esc.

Note that this function is only available in browsers that support full screen mode (especially on older mobile devices, full screen mode is not fully supported; see for details e.g. on caniuse.com).

If the offline IRTlib Player is started with a study that has the Debug entry configured as Fixed mode, the so-called developer tools (DevTools) can be called up via the right mouse button during the task presentation.

Scaling and Alignment

Assessment content created with the CBA ItemBuilder is created for a specific size in pixels (width times height). The content can then be scaled for display on devices with different screen sizes and screen resolutions. In the CBA ItemBuilder, the option under Scaling Options is therefore available in the Preview:

Analogue settings can be made in the IRTlib Editor.

Further Settings


Note: The display settings refer to all survey parts within a study. If several studies are configured in an IRTlib player, the settings must match each other, i.e. it is not possible to administer a study in window mode: window or in window mode: full screen at the same time with one instance of an IRTlib player.


If changed settings are to be retained, the changes must be saved using the disc symbol. Otherwise, the discard icon can be used: